AU625805B2 - Captive self-locking mechanism - Google Patents

Description

40724 89 i OPI DATE 22/09/89 INTER AOJP DATE 19/10/89 APPLN- ID PCT NUMBER PCT/US89/00707 NTREATYPCT )N TREATY(PC) (51) International Patent Classification 4 (11) Int tio Pubication Number: WO 89/ 08207 F16B39/10 Al (43) In ntiofi Publationpat eptember 1989 (08.09.89) (21) International Application Number: PCT/US89/00707 (74) Agents: ABRAHAMS, Colin, P. et al.; Ladas Parry, 3600 Wilshire Boulevard, Los Angeles, CA 90010 (22) International Filing Date: 22 February 1989 (22.02.89) (US).

(31) Priority Application Number: 159,608 (81) Designated States: AT (European patent), AU, BE (European patent), CH (European patent), DE (Euro-, (32) Priority Date: 24 February 1988 (24.02.88) pean patent), FR (European patent), GB (European patent), IT (European patent), JP, LU (European pa- (33) Priority Country: US tent), NL (European patent), SE (European patent).

(71) Applicant: THE BOEING COMPANY [US/US]; 7755 Published East Marginal Way South, Seattle, WA 98124 With international search report.

(72) Inventors: MAHANEY, Bernard, Jr. 13701 S.E.

202nd Court, Kent, WA 98042 BECK, Carl, W.

;9519 S. Meridian, Peck, KS 67120 NIXON, Kim, B. 16407 E. 45th North, Towanda, KS 67144 CONNOLLY, Randolph 1808 Farmstead, Wichita, KS 67208 NUNEMAKER, Terry, V. 8 Frontier Lane, Rose Hill, KS 67133 (US).

(54) Title: CAPTIVE SELF-LOCKING MECHANISM 544 5250 3 38b 46 I46c I \0 38/ 463)44 4I 38 10-46b 32 55 36 -33 (57) Abstract A device for retaining a bolt (38) including a plate having a bore (34) therethrough for receiving the bolt a retainer (42) movably mounted on the plate (31) and movable between a first position in engagement with a selected number of facets on the bolt head and a second position out of engagement with the facets, the retainer (42) having a surface portion (44) for receiving a tool (46) at times when the tool (46) is placed on the head for moving the retainer to the second position, and a biasing device for urging the retainer (42) to the first position at times when the tool (46) is removed from the bolt head.

'i 1 1 WO 89/08207 PCT/US89/00707 CAPTIVE SELF-LOCKING MECHANISM Background of the Invention The invention relates to a retaining mechanism for preventing the rotation of a bolt.

Although a bolt may be fixedly received at its threaded end in an internally threaded bore, the bolt tends to become loosened. For example, vibration or an unintentional striking of the bolt head may cause the bolt to loosen. Thus, devices have been proposed which engage the bolt head to restrict the rotation and resultant loosening of the bolt.

One problem with such proposed devices is that the bolt is often retained by a single levertype device having only a single contact point with the bolt head. Such a device can be relatively easily overcome by a strong force, thereby permitting the loosening of the bolt.

Another problem with the prior art is that, typically, adjusting the bolt head can only be accomplished by releasing the retaining mechanism with one device and by tightening the bolt head with another device, such as an end wrench, a socket wrench, or the like. Such a retaining mechanism is especially difficult to adjust when it is arranged in a confined area since it is difficult to use several tools simultaneously in such a limited space. SUESTITUTE SHEET a-- 4 1;

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L I Another problem with such proposed devices is that, generally, the bolt associated with the retaining mechanism is easily separated from the retaining mechanism. That is, once the bolt is loosened from the threads of the internally threaded bore, the retaining mechanism does not prevent the unintentional removal of the bolt from the assembly. Such a non-captivating, multipiece construction results in the frequent loss or separation of the pieces of the mechanism.

This non-captivating multipiece construction becomes especially burdensome with devices requiring more than one tool to release the retaining mechanism and adjust the bolt. In such cases, one must maintain the retaining mechanism in a released condition in order to insert, 15 adjust, and remove the bolt, while insuring that the bolt does not unintentionally become separated from the retaining mechanism.

Summary of the Invention According to one aspect of the invention, there is provided a device for releasably retaining a bolt in engaging relationship with first and second members having substantially coaxial bores, the bolt having a multifaceted head and a threaded portion at opposite ends of a shank, the head of the bolt engaging the first member 25 and disposed for engagement by a tool, the threaded portion of the bolt threadably engaging threads in the bore of the second member, the device comprising: plate means having a bore therethrough for receiving the bolt, said plate means being secured to said first member with 30 said bore of said plate means in substantially coaxial relationship with the bores of said first and second members, and said bore of said plate means having an internally threaded portion for threadably engaging the threaded portion of said bolt to prevent an unintentional removal of the bolt from the bore of the plate means; retaining means movably mounted on said plate means, said retaining means being movable between a first position in engagement with a selected number of the facets of the bolt head for securing said bolt against 0 -2rotation relative to said first and second members and a sec ond position out of engagement with the facets for permitting said relative rotation, said retaining means having a surface portion positioned to engage said tool at times when said tool is placed on said bolt head for moving said retaining means to the second position and at times when said tool is rotated to effect said relative rotation of said bolt; and means for biasing said retaining means to the first position.

The invention may provide a retaining mechanism that may be adjusted in a confined space, and/or for receiving a bolt which requires only one tool both to release the retaining mechanism and to adjust the bolt. This invention may also provide a retaining mechanism that captivates a bolt when the bolt is in a loosened condition within the retaining mechanism.

Brief Description of the Drawings Fig. 1 is a top view of a retaining device according to a first preferred embodiment of the invention illustrating the device retaining a six facet bolt.

353 -3- WO 89/08207 PCT/US89/00707 4 Fig. 2 is a cross-sectional side view of the preferred embodiment of Fig. 1 taken along line II-II of Fig. 1.

Fig. 3 is a top view similar to the view of Fig. 1 and illustrating the device retaining a twelve facet bolt.

Fig. 4 is a cross-sectional side view of an alternative structure of the embodiment of Fig.

2, illustrating a different type of spring for the device.

Fig. 5 is a front view of the retaining collar of the present invention used in the embodiments of Figs. 1 through 4.

FIG. 6 is a cross-sectional side view taken along line VI-VI of FIG. FIG. 7 is a top view of a second preferred embodiment of the invention illustrating the retaining of a six facet bolt.

FIG. 8 is a side view of the embodiment of FIG. 7.

FIG. 9 is a view similar to FIG. 7, illustrating the retention of a twelve facet bolt.

FIG. 10 is a front view of the retaining member of the embodiment of FIGS. 7-9 without a bolt.

FIG. 11 is a front view of a third preferred embodiment of the invention illustrating retention of a six facet bolt.

FIG. 12 is a cross-sectional side view taken along line XII-XII of FIG. 11.

FIG. 13 is a view similar to FIG. 11 illustrating retention of a twelve facet bolt.

FIG. 14 is a front view of a fourth preferred embodiment of the invention illustrating the SUBSTITUTE SHEET v 1 1 1 1 1 1 1 11 1 :WO. 89/0807 PCT/US89/00707 releasing of a six facet bolt.

FIG. 15 is a view similar to FIG. 14 illustrating retention of a twelve facet bolt.

FIG. 16 is a cross-sectional side view of the embodiment of FIG. 14 taken along line XVI-XVI of FIG. 14.

FIG. 17 is a top view of a six facet bolt.

FIG. 18 is a side view of the six facet bolt of FIG. 17.

FIG. 19 is a top view of a twelve facet bolt.

FIG. 20 is a side view of the twelve facet bolt of FIG. 19.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings.

Generally, the retaining device of the present invention may be used to retain against rotation a bolt having a multifaceted head and a threaded shank. The bolt is adapted to. maintain in engagement first and second members having coaxial bores. The bolt head engages the first member and the threaded portion of the bolt threadably engages a threaded bore in the second member.

The bolt may be any type of conventional bolt having a multifaceted head and a threaded shank.

For example, the bolt may be a six facet bolt 38 shown in detail in FIGS. 17 and 18, or a twelve facet bolt 40 shown in detail in FIGS. 19 and Referring briefly to FIGS. 17-20, each bolt 38, has a respective shank 38a, 40a with a respective externally threaded portion 38b, 40b, adjacent one end of the shank and a respective bolt head 38c, SUBSTITUTE SHEET 1 WO 89/08:7 PCT/US89/00707 6 having a respective multifaceted outer surface 38d, 40d with facets 38e, 40e at an opposite end of the shank.

In accordance with the invention, plate means are provided for receiving the bolt. In the first embodiment, shown in FIGS. 1-6, the plate means includes an annular plate 31 having a flange portion 36 and an integrally-formed cylindrical plate portion 32 having a bore 34 therethrough. In the -second embodiment, shown in FIGS. 7-10, the plate means includes a plate 56 having a bore 57.

In the third embodiment, shown in FIGS. 11-13, the plate means includes a plate 78 having a bore In the fourth embodiment, shown in FIGS. 14-16, the plate means includes a plate 98 and an integrallyformed cylindrical plate portion 100 having a bore 102 therethrough.

In accordance with the invention, the bore of the plate means includes an internally threaded portion for threadably engaging the threaded portion of the bolt. This threaded engagement prevents an unintentional removal of the bolt from the bore of the plate.

Referring to FIGS. 1-6, especially FIGS. 2 and 4, in the first embodiment of the invention threads 59 are provided at an end portion of the bore 34.

Referring to FIGS. 7-10, especially FIG. 8, in the second embodiment of the invention threads 76 are provided in the bore 57 of the plate 56. Referring to FIGS. 11-13, especially FIG. 12, in the third embodiment of the invention threads 96 are provided at an end portion of the bore 80 in plate 78.

Referring to FIGS. 14-16, especially FIG. 16, in the fourh embodiment of the invention threads 126 SUBSTITUTE

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WO 89/08207 PCT/US89/00707 7 are provided at an end portion of the bore 102.

In accordance with the invention, means for securing the plate to the first member are provided. As embodied in the first embodiment of FIGS. 1-6, the securing means includes a pin which pins the plate 31 to a first member 33 at flange 36 of plate 31.

Referring to the second embodiment, shown in FIGS. 7-10, the securing means includes a pin 72 that fixes plate 56 to a first member 74.

In the third embodiment, shown in FIGS. 11-13, the securing means includes a pin 81 that fixes plate 78 to a first member (not shown).

In the fourth embodiment, shown in FIGS. 14- 16, the securing means includes a pin 106 that fixes plate 98 to a first member 110.

In accordance with the invention, retaining means are movably mounted on the plate means for at times retaining the bolt against rotation relative to the plate means. The retaining means are movable between a first position in engagement with a selected number of facets on the bolt head and a second position out of engagement with the facets.

Referring to FIGS. 1-4, in the first embodiment of the invention the retaining means includes a multifaceted collar 42 having multifaceted internal surface 43 for engaging facets 38e in the first position of collar 42.

Spring 48 or 48' urges the collar to the first position. Collar 42 includes axially extending slots 54 and 55 disposed to slidably receive pins 52 and 53 which radially protrude from cylindrical plate portion 32; cooperation between pins 52 and 53 and respective slots 54 and 55 limit the axial SUBSTITUTE

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WO :89/08207 PCr/US89/00707 8 movement of collar 42.

In the second embodiment of the invention, shown in FIGS. 7-10, the retaining means includes an annular retainer 58 having a multifaceted internal surface 60 with individual facets 62 for retaining facets 38e of bolt head 38c. Preferably, annular retainer 58 includes an outer annular portion 64 and an inner annular portion 66. Outer annular portion 64 includes the internal circumferential surface 60 for engaging facets 38e of bolt 38.

Referring to FIG. 8, outer annular portion 64 of the annular retainer 58 is biased outward at an acute angle with respect to inner annular portion 66 in its unstressed condition, or the first position. Preferably, annular retainer 58 is formed from a flexible resilient material having a bias memory which urges outer annular portion 64 to this angular position in the unstressed condition.

Preferably, the flexible resilient material is sheet stock which is formed into the retainer 58 using electronic discharge machinery in order to reduce stress at the formed edges of the retainer.

I y this configuration, multifaceted inner surface 60 engages facets 38e of bolt 38 in the unstressed condition, which corresponds to the first position, thereby maintaining the bolt in a secured, tightened position. Yet, since outer annular portion 64 is flexible, it may be moved to a second position away from facets 38e of the bolt upon applying a predetermined amount of force.

Referring to FIGS. 11-13, in the third embodiment of the invention the retaining means includes spring biased plungers 84 for engaging a SUBSTITUTE

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WO 89/08207 PCT/US89/00707 selected number of facets 38e on bolt head 38c.

Each spring biased plunger 84 includes a housing 86 containing a spring 87 and a plunger element 88 biased by spring 87 for movement between a first and second position through an aperture 90 in housing 86. Flanges 89 on plunger element 88 engage the circumferential edge of housing 86 adjacent aperture 90 for preventing ejection of plunger element 88 from housing 86 by the force of spring 87.

Spring biased plungers 84 are mounted in bores 92 of plate 78. Preferably, three spring biased plungers 84 are provided adjacent bolt head 38c for engaging a selected number of facets 38e.

Providing three spring biased plungers insures that at least two facets 38e of bolt head 38c are engaged by the plunger elements 88 for preventing rotation of bolt 38, even though one spring biased plunger may be pressed axially inward by a facet of the bolt head.

Referring to the fourth embodiment shown in FIGS. 14-16, the retaining means includes levers 116, 117 for engaging a selected number of facets 38e on bolt head 38c. Levers 116 and 117 are pivotable about axes disposed substantially parallel to bore 102. Levers 116 and 117 are pivotally mounted on plate 98 by pins 118 and 119, respectively.

In accordance with the invention, each of the retaining means includes a surface portion positioned to engage a tool at times when the tool is placed on the bolt head for moving the retaining means from the first position in engagement with facets on the bolt head to the second position out SUBSTITUTE

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r 1 i WO: 89/0807 PCT/US89/00707 of engagement with the facets on the bolt head.

The surface portion remains in engagement with the tool at times when the tool is rotated to adjust the bolt.

Referring to the first embodiment of the invention, shown in FIGS. 1-6, the surface portion of the retaining means is a flat circumferential edge 44 of collar 42 which receives an opposing circumferential edge 46b of tool 46.

Referring to the second embodiment, shown in FIGS. 7-10, the surface portion of the retaining means that receives tool 46 is a flat circumferential edge 64a of outer annular portion 64.

In the third embodiment, shown in FIGS. 11-13, the surface portion of the retaining means that receives tool 46 is an end portion 94 of plunger element 88.

Referring to the fourth embodiment, shown in FIGS. 14-16, the surface portion of the retaining means that receives tool 46 is a sloped surface 124 and 125 on each of tne respective levers 116 and 117.

In accordance with the invention, biasing means are provided to bias the retaining means in the first portion in engagement with the bolt head.

Referring to the first embodiment, shown in FIGS. 1-6, the biasing means is a spring, such as a belleville spring 48 shown in FIG. 2 or a coil spring 48' shown in FIG. 4.

In the second embodiment, shown in FIGS. 7-10, the biasing means is the bias memory of outer annular portion 64.

SUBSTITUTE

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WO 89/08207 P CT/US89/00707 11 Referring to the third embodiment, shown in FIGS. 11-13, the biasing means is spring 87 contained in housing 86 of spring biased plunger 84.

Referring to the fourth embodiment, shown in FIGS. 14-16, the biasing means is a coil spring 120 fixed at one end 120a thereof to a first lever 116 and at another end 120b thereof to a second lever 117. A pin 122 is positioned through the coils of the coil spring 120 for pinning spring 120 to plate 98.

The following is a description of the operation of the first embodiment of the invention.

In the first position, shown in FIG. 2 with a six facet bolt 38, collar 42 is biased axially outward by spring 48, so that internal surface 43 engages a selected number of facets 38e for securing the bolt 38 against rotation relative to plate 31. In the second position, collar 42 is moved axially inward, placing internal surface 43 out of engagement with facets 38e of bolt 38 by a tool 46.

Tool 46 then may be rotated to adjust the bolt with .respect to plate 31 without interference by collar 42. Once the bolt is adjusted to a desirable position, the tool may be removed to permit collar 42 to spring back into engagement with the bolt I head.

Tool 46, shown in dashed lines in FIGS. 1 and 2, preferably has a circumferential inner surface 46a similar in shape to faceted outer surface 38d of bolt head 38c (or bolt head 40c) in order to surround bolt head 38c and movably engage edge 44 of collar 42. SUBSTITUTE SHEET i 1 11 1 1 1 1 i 1 rotation relative to said first and second members and a second position out of engagement with the facets for permitting said relative rotation, said retaining means WO 89/08207 PCr/US89/00707 12 Threads 38b threadably engage the threaded bore in the second member 33a for securing the first member 33 and the second member 33a.

Additionally, threads 59 in bore 34 threadably engage the threaded portion 38b of bolt 38 upon insertion and removal of the bolt from bore 34.

Threads 59 require the bolt to be rotated in order to bypass cylindrical plate portion 32, thereby preventing the unintentional removal of bolt 38.

Thus, when the bolt is loosened to disengage second 4 member 33a, bolt 38 is only slidable within the 4bore 34 until threads 38b of bolt 38 engage threads 59 of bore 34. The bolt then can not be totally removed from bore 34 without being rotated.

The following is a description of the operation of the second embodiment of the J invention. In the first position of the retaining device, shown in FIG. 8, multifaceted internal surface 60 of outer annular portion 64 of retainer 58 engages facets 39e of bolt head .s8c. To adjust the bolt, tool 46 (shown in dashedlines in FIG. 2) is placed around bolt head 38c and outer annular W portion 64 is pushed inward, toward plate 56 and away from bolt head 38c. Once outer annular retainer 64 is removed from bolt head 38c, the tool may freely rotate the bolt for adjustment thereof.

Upon rempvilng the tool, outer annular portion 64 of retainer 58 springs back into engagement with the bolt head, to the position shown in FIG. 8.

Again,/' internal threads 76 for threadably receiving external threads 38b of bolt 38 require bolt 38 to be rotated in order to bypass plate 56, thereby preventing the unintentional removal of bolt 38. Moreover, threads 38b engage the SUBSTITUTE SHEET WO (~089/08207 PCT/US89/'0707 13 internally threaded bore of a second member.

The following is a description of the operation of the third embodiment of the invention.

Referring to FIGS. 11-13, in the first or unstressed condition, spring plungers 84 are biased axially outward, away from plate 78, by spring 87.

The sides 93 of plunger elements 88 engage facets 38e of bolt head 38c. By engaging facets 38e, the bolt head is prevented from rotating and thereby becoming loosened.

To adjust the bolt, tool 46 (shown in dashed lines in FIG. 2) is placed around bolt head 38c.

The edge 46a of tool 46 engages the end 94 of plunger elements 88. The pressure of tool 46 compresses spring 87 and pushes the plunger elements 88 back into housing 86, out of engagement with bolt head 38c. Once plunger elements 88 are moved away from bolt head 38c, tool 46 may freely rotate bolt 38 for adjustment thereof. Upon removing tool 46, plunger elements 88 spring back into engagement with facets 38e of bolt head 38c, to the engaging position shown in FIG. 12.

Again, internal threads 96 for threadably engaging external threads 38b of bolt 38 require bolt 38 to be rotated in order to bypass plate 78, iJI thereby preventing the unintentional removal of bolt 38 from the retaining assembly. Additionally, threads 38b engage the internally threaded bore of a second member.

The following is a description of the operation of the fourth embodiment of the invention, shown in FIGS. 14-16. Referring particularly to FIG. 15, in the first position, levers 116 and 117 are pivoted inward within a SUBSTITUTE SHEET 'F "l i; WO 89/08207 PCT/US89/00707' 14 plane parallel to plate 98 so that a retaining surface engages a selected number of facets 38e to secure bolt 38 against rotation. In the second position, shown in FIG. 14, levers 116 and 117 are pivoted outward, away from the selected number of facets 40e, to release facets 40e of the bolt head and to permit relative rotation of bolt 40 with respect to plate 98.

Again, cylindrical plate portion 100 preferably has internal threads 126 along its bore 102 for threadably engaging external threads 38b of bolt 38 upon insertion and removal of the bolt from bore 102. These threads 126 require bolt 38 to be rotated in order to bypass cylindrical plate portion 100, thereby preventing the unintentional removal of bolt 38 from the retaining assembly. i Additionally, threads 38b engage the internally threaded bore of a second member.

To pivot levers 116, 117 outward to a second position, tool 46 (shown in dashed lines in FIG. 2) is placed around the bolt head 38c. The edge 46a of tool 46 engages sloped surfaces 124, 125 of the levers 116, 117, respectively. The inward movement of the tool 46 along sloped surfaces 124, 125 causes levers 116, 117 to pivot outward against the force of spring 120. Once levers 116, 117 are moved away from the bolt head 38c, tool 46 may freely rotate bolt 38 for adjustment thereof. Upon removing tool 46, levers 116, 117 spring back into engagement with bolt head 38c by the force of spring 120.

It will be apparent to those skilled in the i I art that various modifications and variations can be made in the construction of these retaining SUBSTITUTE SHEET WO 89/08207 PCT/US89/00707 mechanisms without departing from the scope of spirit of the invention. For example, in the preferred embodiment of FIGS. 11-13, a variable number of spring plungers may be distributed at variable points around the circumference of a bolt head, depending on the requirements for a particular application of the retaining mechanism.

Moreover, it should be clear that the retaining device of the invention is adapted to be used with any type of bolt. Six and twelve facet bolts are shown by way of example only.

Other embodiments of the invention will be apparent to the skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

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Claims (17)

1. A device for releasably retaining a bolt in engaging relationship with first and second members having substantially coaxial bores, the bolt having a multifaceted head and a threaded portion at opposite ends of a shank, the head of the bolt engaging the first member and disposed for engagement by a tool, the threaded portion of the bolt threadably engaging threads in the bore of the second member, the device comprising: plate means having a bore therethrough for receiving the bolt, said plate means being secured to said first member with said bore of said plate means in substantially coaxial relationship with the bores of said first and second members, and said bore of said plate means having an internally threaded portion for threadably engaging the threaded portion of said bolt to prevent an unintentional removal of the bolt from the bore of the plate means; retaining means movably mounted on said plate means, said retaining means being movable between a first position in engagement with a selected number of the facets of the bolt head for securing said bolt against I rotation relative to said first and second members and a second position out of engagement with the facets for permitting said relative rotation, said retaining means having a surface portion positioned to engage said tool at times when said tool is placed on said bolt head for moving said retaining means to the second position and at times when said tool is rotated to effect said relative rotation of said bolt; and 30 means for biasing said retaining means to the first Sposition.

2. The device of claim i, wherein said retaining means includes a plurality of abutting members for engaging said selected number of facets on said bolt head in said first position of said retaining means.

3. The device of claim 2, wherein said retaining means is axially movable with respect to said bore of said plate means between said first and second positions. 4 The device of claim 3, wherein the bore of the plate 0 -16- cb ~I A means terminates at a planar surface disposed in a plane perpendicular to the axis of the bore of the plate means, and wherein said abutting members are disposed substantially flush with said surface at times when said retaining means is in said second position and wherein said abutting members protrude beyond said planar surface to engage said selected number of facets in the first position. The device of claim 4, wherein said retaining means includes an annular member having a multifaceted internal surface for engaging said facets of said bolt head in said first position.

6. The device of claim 5, wherein said annular member includes a collar and wherein said biasing means includes a spring disposed on said plate means and engaging said collar for urging said collar to encircle the bolt head in the first position.

7. The device of claim 6, said plate means including a plate having a cylindrical portion extending integrally 20 therefrom, said plate having a flange portion for affixing S* said plate to said first member, said collar being movably I mounted on said cylindrical portion of said plate means.

8. The device of claim 7, wherein the retaining means j includes pin means for mounting said collar on said cylindrical portion, and wherein said collar includes a slot means to receive said pin means for permitting limited axial movement of said collar.

9. The device of claim 7 or claim 8, wherein said spring is disposed around said cylindrical portion and between said plate and said collar for urging said collar S"to said first position. 1. 0. The device of any one of claims 6 to 9, wherein said spring includes a coil spring.

11. The device of any one of claims 6 to 9, wherein said spring includes a belleville spring.

12. The device of claim 4, wherein said retaining means includes an inner annular member disposed parallel to said planar surface and having an aperture therein for W receiving said bolt and an outer annular member having a 0 z-17- iiv 9 9 multifaceted internal surface for engaging said facets of said bolt head in the first position, said outer annular member being biased at an acute angle with respect to said inner annular member in said first position of said retaining means.

13. The device of claim 12, wherein said outer annular member is made of a resilient material for permitting a pivoting movement of said outer annular member betweeni said first and second positions.

14. The device of claim 4, wherein said retaining means includes a plurality of spring biased plungers, each said spring biased plunger including a housing containing a spring and a plunger element biased by said spring for movement through an aperture in said housing, and wherein each said plunger element extends beyond its housing in said first position for engaging a said facet for securing said bolt against rotation, and wherein each said plunger element is movable against the bias of its spring into its housing to said second position to release said facets for permitting said relative rotation. The device of claim 14, wherein said spring biased plungers are mounted in compartments provided in said plate means.

16. The device of claim 14 or claim 15, wherein three spring biased plungers are provided for engaging said selected number of facets, said spring plungers being positioned at selected angular positions around said bore of the plate means to insure the engagement of a preselected number of facets by said spring biased 30 plungers for any orientation of said bolt head.

17. The device of claim 2, wherein said retaining means are movably disposed on said plate means about axes disposed parallel to the bore of said plate means.

18. The device of claim 17, wherein said retaining means include retaining surfaces for engaging said facets of said bolt head in said first position of said retaining means.

19. The device of claim 18, wherein said retaining means include levers pivotally mounted on said plate means, and 4-18- 7r (V~ ~I wherein said biasing means includes a spring fixed at opposing ends thereof to respective ones of said levers for urging said levers to said first position in engagement with said facets of said bolt head.

20. The device of claim 19, wherein said tool engaging surface portion of each of said levers has a sloped configuration for operative engagement by said tool to move said levers to said second position during engagement of said bolt head by said tool.

21. The device of claim 1, substantially as herein described with reference to any one of the embodiments thereof shown in the accompanying drawings. DATED: 22 APRIL, 1992 PHILLIPS ORMONDE FITZPATRICK Attorneys For: THE BOEING COMPANY 20 0 Jfi^ *o 805L -19- -i r